Selenium Sequestration in a Cationic Layered Rare Earth Hydroxide: A Combined Batch Experiments and EXAFS Investigation
Zhu, L; Zhang, LJ; Li, J; Zhang, D; Chen, LH; Sheng, DP; Yang, ST; Xiao, CL; Wang, JQ; Chai, ZF; Albrecht-Schmitt, TE; Wang, S
2017
发表期刊ENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN0013-936X
卷号51期号:15页码:8606-8615
文章类型期刊论文
摘要Selenium is of great concern owing to its acutely toxic characteristic at elevated dosage and the long-term radiotoxicity of Se-79. The contents of selenium in industrial wastewater, agricultural runoff, and drinking water have to be constrained to a value of 50 mu g/L as the maximum concentration limit. We reported here the selenium uptake using a structurally well-defined cationic layered rare earth hydroxide, Y-2(OH)(5)Cl center dot 1.5H(2)O. The sorption kinetics, isotherms, selectivity, and desorption of selenite and selenate on Y-2(OH)(5)Cl center dot 1.5H(2)O at pH 7 and 8.5 were systematically investigated using a batch method. The maximum sorption capacities of selenite and selenate are 207 and 124 mg/g, respectively, both representing the new records among those of inorganic sorbents. In the low concentration region, Y-2(OH)(5)Cl center dot 1.5H(2)O is able to almost completely remove selenium from aqueous solution even in the presence of competitive anions such as NO3-, Cl-, CO32-, SO42-, and HPO42-. The resulting concentration of selenium is below 10 mu g/L, well meeting the strictest criterion for the drinking water. The selenate on loaded samples could be desorbed by rinsing with concentrated noncomplexing NaCl solutions whereas complexing ligands have to be employed to elute selenite for the material regeneration. After desorption, Y-2(OH)(5)Cl center dot 1.5H(2)O could be reused to remove selenate and selenite. In addition, the sorption mechanism was unraveled by the combination of EDS, FT-IR, Raman, PXRD, and EXAFS techniques. Specifically, the selenate ions were exchanged with chloride ions in the interlayer space, forming outer-sphere complexes. In comparison, besides anion exchange mechanism, the selenite ions were directly bound to the Y3+ center in the positively charged layer of [Y-2(OH)(5)(H2O)](+) through strong bidentate binuclear inner-sphere complexation, consistent with the observation of the higher uptake of selenite over selenate. The results presented in this work confirm that the cationic layered rare earth hydroxide is an emerging and promising material for efficient removal of selenite and selenate as well as other anionic environmental pollutants.
关键词Anion-exchange Materials Adsorption Mechanisms Intercalation Hosts Sulfate Adsorption Phosphate Removal Aqueous-solutions Gd-lu Selenate Water Sorption
DOI10.1021/acs.est.7b02006
关键词[WOS]ANION-EXCHANGE MATERIALS ; ADSORPTION MECHANISMS ; INTERCALATION HOSTS ; SULFATE ADSORPTION ; PHOSPHATE REMOVAL ; AQUEOUS-SOLUTIONS ; GD-LU ; SELENATE ; WATER ; SORPTION
收录类别SCI
语种英语
WOS记录号WOS:000406982600044
引用统计
文献类型期刊论文
条目标识符http://ir.sinap.ac.cn/handle/331007/28810
专题中科院上海应用物理研究所2011-2018年
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GB/T 7714
Zhu, L,Zhang, LJ,Li, J,et al. Selenium Sequestration in a Cationic Layered Rare Earth Hydroxide: A Combined Batch Experiments and EXAFS Investigation[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2017,51(15):8606-8615.
APA Zhu, L.,Zhang, LJ.,Li, J.,Zhang, D.,Chen, LH.,...&Wang, S.(2017).Selenium Sequestration in a Cationic Layered Rare Earth Hydroxide: A Combined Batch Experiments and EXAFS Investigation.ENVIRONMENTAL SCIENCE & TECHNOLOGY,51(15),8606-8615.
MLA Zhu, L,et al."Selenium Sequestration in a Cationic Layered Rare Earth Hydroxide: A Combined Batch Experiments and EXAFS Investigation".ENVIRONMENTAL SCIENCE & TECHNOLOGY 51.15(2017):8606-8615.
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